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This research aimed to characterize and apply a fiber obtained from a fruit residue as a fat substitute in ice creams. The by‐product of the processing of red pitaya pulp dried at low temperature proved to be a source of dietary fiber, with high soluble fiber content, and to have suitable technological properties, which is indicative of its potential as a fat replacer in foods, besides containing antioxidant properties. The addition of the fiber into strawberry ice cream improved overrun and rheological behavior of the sample with 73.5% fat reduction and resulted in a product with high overall acceptability, demonstrating that it is an alternative for the food industry to reduce fat with an increase in the nutritional value of products. Practical applications This work aimed to highlight the potential application of the flour produced from the red pitaya processing residue as a fat substitute in strawberry ice cream. The peel powder presented appropriate technological characteristics, besides a high fiber content, indicative that it can be used in several products in order to improve its nutritional value and physical parameters. The ice creams developed had a proper sensory evaluation, suggesting that they could be produced by the food industry and placed on the market for sale to specific consumers worried about healthy and adapted at a calorie‐reduced diet.

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In this work, the feasibility of infrared thermal imaging (ITI) is demonstrated to show its potential application in analytical chemistry. A system of ITI was combined with disposable microplates to perform enthalpimetric analysis, which was selected as an example in order to show the reliability of this method. In this way, the novel thermal infrared enthalpimetry (TIE) method was evaluated in neutralization, precipitation, redox, and complexation reactions, with a multichannel pipet for adding the reagent and an infrared camera to monitor the temperature of multiple reactions (up to 24 simultaneous reactions) in a contactless way. Analytical signals were obtained in only 10 s, and the difference in temperature (ΔT) before and after the reaction was used for the construction of calibration curves by use of reference solutions. More than 10,000 values were considered for the temperature determination for each reaction. The proposed method was applied for determination of the total acidity of vinegar as well as the chloride, iron, and calcium content of pharmaceuticals. The results were compared with those from conventional techniques (titration), and agreement between 96% and 101% was obtained. Sample throughput could even reach thousands of samples analyzed in 1 h. These preliminary results demonstrate the important features of TIE and possible application for other matrices and analytical parameters. The proposed TIE could be spread to cover other enthalpimetric techniques, different reactors (e.g., microfluidic and paper analytical devices), and portable devices, thus reaching other fields of chemistry.

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